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Expected performances of the Characterising Exoplanet Satellite (CHEOPS). I. Photometric performances from ground-based calibration
Queloz, D.; Benz, W.; Deline, A. +6 more
Context. The characterisation of Earth-size exoplanets through transit photometry has stimulated new generations of high-precision instruments. In that respect, the Characterising Exoplanet Satellite (CHEOPS) is designed to perform photometric observations of bright stars to obtain precise radii measurements of transiting planets. The CHEOPS instr…
Nongravitational Effects of Cometary Activity
Keller, Horst Uwe; Skorov, Yuri; Mottola, Stefano +4 more
Nongravitational forces induced by sublimation of volatiles affect the rotational and orbital dynamics of comets. In addition to contributing to the improvement of ephemerides and of rotational models, nongravitational effects can help constrain the regional distribution and temporal evolution of cometary activity, which in turn provides input for…
A Model-insensitive Baryon Acoustic Oscillation Feature in the 21 cm Signal from Reionization
Trac, Hy; Cain, Christopher; D'Aloisio, Anson +2 more
We examine the impact of baryon-dark matter relative velocities on intergalactic small-scale structure and the 21 cm signal during reionization. Streaming velocities reduced clumping in the intergalactic medium on mass scales of ∼104-108 M⊙. This effect produced a distinct baryon acoustic oscillation (BAO) feature …
The nature of the companion in the Wolf-Rayet system EZ Canis Majoris
Schmutz, W.; Koenigsberger, G.
Context. EZ Canis Majoris is a classical Wolf-Rayet star whose binary nature has been debated for decades. It was recently modeled as an eccentric binary with a periodic brightening at periastron of the emission originating in a shock heated zone near the companion.
Aims: The focus of this paper is to further test the binary model and to cons…
INTEGRAL View on cataclysmic variables and symbiotic binaries
Doroshenko, Victor; de Martino, Domitilla; Falanga, Maurizio +5 more
Accreting white dwarfs (WDs) constitute a significant fraction of the hard X-ray sources detected by the INTEGRAL observatory. Most of them are magnetic Cataclysmic Variables (CVs) of the intermediate polar (IP) and polar types, but the contribution of the Nova-likes systems and the systems with optically thin boundary layers, Dwarf Novae (DNs) an…
A census of young stellar population associated with the Herbig Be star HD 200775
Mathew, Blesson; Manoj, P.; Lee, Chang Won +4 more
The region surrounding the well-known reflection nebula, NGC 7023, illuminated by a Herbig Be star, HD 200775, located in the dark cloud L1174 is studied in this work. Based on the distances and proper motion values from Gaia DR2 of 20 previously known young stellar object (YSO) candidates, we obtained a distance of 335 ± 11 pc to the cloud comple…
On the nature of the soft γ-ray emission in the hard state of the black hole transient GRS 1716-249
Motta, S. E.; Segreto, A.; Casella, P. +9 more
The black hole transient GRS 1716-249 was monitored from the radio to the γ-ray band during its 2016-2017 outburst. This paper focuses on the spectral energy distribution (SED) obtained in 2017 February-March, when GRS 1716-249 was in a bright hard spectral state. The soft γ-ray data collected with the INTEGRAL/SPI telescope show the presence of a…
A Statistical Search for Star-Planet Interaction in the Ultraviolet Using GALEX
Mathew, Blesson; Manoj, P.; Kartha, Sreeja S. +2 more
Most (∼82%) of the over 4000 confirmed exoplanets known today orbit very close to their host stars, within 0.5 au. Planets at such small orbital distances can result in significant interactions with their host stars, which can induce increased activity levels in them. In this work, we have searched for statistical evidence for star-planet interact…
Magnetohydrodynamic Turbulent Evolution of a Magnetic Cloud in the Outer Heliosphere
Telloni, Daniele; Zank, Gary P.; Adhikari, Laxman +8 more
This Letter exploits joint observations of the same interplanetary coronal mass ejection by widely separated spacecraft to study, for the first time, the turbulent evolution of the magnetohydrodynamic (MHD) properties of the embedded magnetic cloud, during its propagation throughout interplanetary space. Specifically, the event was observed by Win…
Mirror, mirror on the outflow cavity wall. Near-infrared CO overtone disc emission of the high-mass YSO IRAS 11101-5829
Stecklum, B.; Coffey, D.; Natta, A. +7 more
Aims: The inner regions of high-mass protostars are often invisible in the near-infrared, obscured by thick envelopes and discs. We aim to investigate the inner gaseous disc of IRAS 11101-5829 through scattered light from the outflow cavity walls.
Methods: We observed the immediate environment of the high-mass young stellar object IRAS 1…